Compound fluid-pressure motor.



1.x .T E un. H s. T E E H s D. Z EA ID I NF'R AAO MMT REO. EMMM TABS SM 1 ALDURL Mise. -wmmw HRD u W 1 DP I uw Um Y L FM Dm Nm WA D.. M 0 G PATENTEDJUNE 12', 1900.

No. 023,060 I z SHEETS-*SHEET 2 D. w E ID l NN'DD. AMG MRW RE EMM TAB SMR A. HU 0% E MR RP. MD AAI nu L S mw MN AU 0 MDM..

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APPLICATION FILED AUG. l, 1905.

. high-pressure cy -ducing the amount of this back pressure by UNrrnn STAESWPATENT, OFFICE.

'JOSEPHv i?. MAG-Nav AND WILLrAMfH.

MASTERMAN.' OF Los ANGELES,

CALI FORNIA. .FREDERICK R.` KELLOGGr4 yADB'IIIUS'IRATOR OF SAID MASTERMAN, DECEASED, ASSIGNOBS TO NATIONAL ENGINE COM-'- PANY, OF Los ANGELES, TERRITORY. f

CALIFORNIA, vA CORPORATION OF ARIZONA coMPouNn FLUID-Passsuns' moron.v`

5 county of Los Angeles and State o California,

have invented a new and useful Com ound Fluid-Pressure Motor, of which the fol owing is a specification.

An im ortant object of the invention is to reduce t 1e -back ressure which exists in the linder or cylinders of comf pound engines or fiuid-pressure motors. In such engines each of the lower-pressure cyl-4 inders is usually supplied with operating fluid x5 from the low-pressure side of the cylinder at next higher pressure, so that there is negesrarily a back pressure on such low-pressure sidefequal to t e intake pressure on-the next cylinder.

This invention providesfor materially relying the low-pressure cylinder from the l SQPII;

'l hig -pressure cyllnder at lntermediate pressure, the Huid for operating the low-pressurecylinder being taken from the high-pressure linder before it has been fully expanded y A further object of this invention is to 'provide a Huid-pressure motor of the rotary type wherein the expansive-force ofY the steam or o erating medium is utilized in a series or p urality of operationst at successively lower pressure, thereby obtainin the advantages of economy due to compoun minish and 'uti 'ze the vleakage which occurs in rotary engines. The accompanying drawingsillustrate the invention.

Figure 1 is a plan. Fig. I2 is a longitudinal vertical section on line z at',- Fig. 1'. v Fig. 3 is a transverse section on line x3, Fi 1.

' Fig. 4 is a transverse section on line :c 1;

Fig. 5 is a transverse section on line an* ai, Fig. 1,.

l4,5* Fi 6 is-a'section on line zin Fig. 4.- p h eengine is herein shown as a tliplefex-l pansion. engine; but it willbe understood that anynumber of expansions may be used. 1, 2, and 3=designate, .respect1vely, the

5o high pressure, intermediate pressure, and 'f low-pressure cylinders -.or,casings, ,which are Specification of Letters Patent. i Application lad Augusti'll, 1905. Serial Ille.v 2f7216'2.

.nally within the cylinders.V

-ate"pressure outletfpott on Patented June 12, 19.06.

arranged longitudinally in line with one another and rovided withilan es 4, whereby they are olted to end ,an intermediate plates 5 6 7 8. Two shafts 9 9 are journaled and extend parallel to one another longitudi-v ton members are arranged in pairs,l as at 10 10 11 11 12 12', in the respective cylinders, the said piston members eing toothed or l formed as gears, as at '13, to engage vor inter- 'mesh with one another to-prevent the pas- .sage of steam therebetween. A part of the lnner fac-e or Wall of each cylinder-chamber is rentrant or shaped, as at 14, tot or conform to the peripheral 'pistons of the teeth of 'the pair of pistons therein,` so that the pistons will make a substantially steam-tight joint inpassing over saidwall ortion, and it-ls at this rentrant ortion o the piston move-' ment that the uid-pressure is exerted thereon.- Thepistons 10.11 12 are fixed on their shaft 9, and one .of the istons-say 10C-0n the other shaft may a o be fastened; but the therpistons-sayll l12-are preferably loose on s aft 9 to insure steam-tig t engage.; ment ofthe teeth. p 15 'designates a high-pressure steam-inlet pipe communicating throughport 15 into the high-pressure cylinder-chamber at the. rentrant portion aforesaid at the point Awhere the paths of the pistoeriplhleries diar et-ports verge. 17' designate'lsi in the intermediate or low .pressure cylin-r A further ob'ct o the invention'is to did therein'. Said means may consist, of abr'anched or Vf ipe 16,- connected to saidinlet` ort 16. an communicating witlr'lportsj -ssf lnthe ends or plates 5 6 7 8 by bearlngs 25 26 Rotors or pis- 16, arrangedgin .the 'wall'.f-portion'-14. at.

pointsA on'elther sideoff thecentralinlt-pbrtf 15, y and sufficiently reniet..11,213.61li-t5..frffiflfA lao in sure that a ltooth or; peripheral portion, -131of Aeaoh'piston will always eXtendi-betveeu the hglrpressure -inlet-port and this,

I" `bores/27 and loutlets or perforations 28 ex- 'the M-Lpipe 17 'also have communication through orts 17, opening into the Wall portion' .14 o the intermediate Ipressure-cylinder tions, so that t AZat` each side ofthe centra inlet portion 16 at positions corresponding to the position of the orts 16" in the high-pressure cylinder.- eyond the port 14 the inner Wall of each cylinder may be recessed Aor made larger, as shown at 18, so as to be clear of the teeth or peripheral portions of thepistons, thereby diminishing t e friction and'forming a space or chamber 19 for the free assage of steam at the low-pressure side of t e pistons.y This chamber. may communicate by opening 19 or 19a With the low-pressure conduits or ports 17'. In the low-pressure cylinder the corresponding space or chamber 2O has an outlet or exhaustort connection 20. 21 designates ribs W 'ch extend across the ports 15 16 17 to strengthen'the structure.

Means are rovided for oiling the engine through the s afts thereof, said means'consisting of oil-supply pipe 22, communicating through branch pipe 23 With couplings 24 on bearings 25 at one end of the respective shafts 9 9, said shafts having`longitudinal tending therefrom to the bearings 25, 26,29 of the shaft in the Walls 5 6 7 8. `Said shafts are closed at the other end and provided with stuffing-boxes 30 31'.. 31 designates the pulley onthe shaft 9 for taking off the power therefrom The operation is as follows: Steam or fluid pressure medium being admitted at inlet 15 of the high-pressure cylinder fills the space between the teeth of the piston members or rotors immediately adjacent thereto. The teeth of the said members mesh with one another in such a manner as to make a substantially steam-tight joint at their point of contact or engagement, and the areas exposed to pressure on the teeth are unbalanced or unequal 4in opposite circumferentialdirecere is a resultant circumferential pressure on the rotors acting to turn same in the direction of the arrows 1n Fig. 3.

As each intertooth s ace Which has thus been exposed to receive uid steam-pressure from the inlet passes. under the portien 14 ,of the cylinder-Wall itI will carry with it thesteam pocketed therein, and as said space comes into communication With the port 16 said steam will .escape through said port to a greater or less extent, dependent upon the size of said port and the velocity of the piston member. For exam le, the ressure in the pipe 16 or at the inta e side o the intermediate cylinder may be maintained at..

about onealf that of the pressure at the inlet 15, and in that case the ports 16 will lbe proportioned to deliver to Withdraw from the intertooth space aforesaid about one-half of the steam therein contained, the Vpressure 'in said space being simultaneously reduced to about one-half the original pressure. ln the further rotation of the piston members said intertooth space is closed by a further Wall portion 14 of the cylinder-casing and is then brou ht into communication with the port 17, eading to the low-pressure cylinder, which ort Will draw steam from said space, reducin the pressure therein to, say, one-fourth of t e original pressure. Then in the further rotation said intertooth space will be brought-into communication with the lowressure. chamber 19 of the high-pressure cylinder, which chamber is in permanent connection with the highressure side of the low-plll'essure cylinder. lV bile this operation is ta 'ng place in the high-pressure cylinder the steam which passes at intermediatepressure-say fifty-one ounds-from the ports 16 t o the inlet 16 of) the intermediate cylinder enters the latter between the tooth ofthe piston members thereof, which are immediately adjacent to the inlet and operates thereon to produce rotation ofsaid piston members, and in such rotative movement the steam is ocketed between the intertooth spaces an carriedaround to the ports 17a at which it is Withdrawn at lowpressure to the intake of the low-pressure cylinder. .Thus the pistons' open communication necessarily with the inlet and outlet ports 1'5.16 17 the `steam iirst exerting itsforce at full pressure in the high-pressurecylinder and being 'then divided apart, say, one-half, being used at half pressure in the lintermediatepressure engine and the other part passing around in the highressure cylinder, and being taken to the 'ow-pressure cylinder toether With the first portion coming from the lntermediate cylinder.

It Will be noted that the back pressure in' the high-pressure cylinderis lower than the pressure at the intake 'of the intermediate cylinder, being, for example, twenty-five pounds, With one hundred pounds high pressure and ii" gpounds intermediate pressure, Whereas Wit the ordinary system of compounding the back pressure in the hi h-pressure cylinder would be'the same as tlie presq sure at the intake of the intermediate cylinder, say, fifty pounds. An increase of oWer and Work developed is thereby obtaine vfrom the high-pressure cylinder. Advantage is also lobtained by the restriction of the highpressure zone in the cylinder to a oint immeiately adjacent to the inlet. y reducing the extension of the area or movement over which the high pressure is exerted'thefamount of leakage and also the side 'thrust on the shafts are greatly reduced.

What l claim? isl 1. A compound engine, comprising-ahigh- 2. A compound engine comprising a highpressure cylinder having an mlet-port and having a plurality of outlet-ports. and a piston member movable in the cylinder and provided with fluid-receiving means communicating, in the movement of said piston member, successively with the inlet-port and with the outletorts for deliverin to said outlet- .ports iiui at successively lgower pressures and cylinders having supply connections re-- s pectively to said outlet-ports.

3. A compound engine comprising a-hig pressure ycylinder and a lower-pressure cylinder connected to the high-pressure cylinder at a point of intermediate pressure therein.

4. A compound engine comprising a plurality of cylinders, rotarypiston members vtherein having mtermeshlng teeth, the wall of each cylinder having a portion extending between the piston members to fit4 the eripheral faces ofthe teeth, and provided with a central inlet-port, said wall portion oi' one of the cylinders being-provided With an outlet-port at one side of the inlet and a connection between said outlet and the inlet of-another cylinder. 5. A compound engine comprising a plurality of cylinders, rota piston members therein having intermeshing teeth, the wall of'each cylinder having aportion extending between the'A iston members to fitthe peripheral facesof the teeth, and provided with" .a central-M6699, s aidwu Olftonof-olie ofthe cylinders beingI provide' .Withanoutp let-portat ,each side of the inlet Vand a connection betweensaid outlet and -the inlet-Ofanothercylinder. '5 j f .i

6. A compound engine comprising a highpressure cylinder having a high-pressure in et and intermediate and low pressure outlets, piston members invsaidy cylinder movable toH open communication-with said portssucces-f sively, an intermediate'jpressure'j'cylinder having an /inlet connected to the aforesaid vintermediate outlet-port of the high-pressure cylinder and. having'an outlet connected to high-pressure cylinder.`

7. A compoundengine comprising a highpressure cylinder having a high-pressure inlet and intermediate and low-pressure outlets, piston members in said cylinder movable to open communication with said ports the aforesaid .low-pressure outlet-port of the,l outlet connection from a point of intermedisuccessively, an intermediate-pressure cylinder having an inlet connected to the aforesaidintermediate outlet-port of the highpressure cylinder and having an outlet connected to the aforesaid low-pressure outletport of the high-pressure cylinder, and a lowpressure ycylinder p rov ic i ed,` with van outlet and having an inlet-port connected to thelow-pressure outlet ofthe high-pressure cylinder and to the outlet of the intermediatepressure cylinder.

8. An engine comprising two rotary piston members provided with intermeshing teeth and a cylinder inclosing said -members and having a wall portion extendin between thev ,members and fitting the perip eral' faces of the teeth of said members, said wall portion innerwalll of the cylinder 'being' clear of the piston membersat other points. n

9. An engine comprising two rotary piston members formed as intermeshing gears anda cylinder inclosing said gears and formed onone wall with a face portion extendin beT tween said gears and fittingrthe 'perip eral faces of the teeth thereof, said fac'e portion being provided with'inlet and outlet ports and the remaining portion of said Wall ofthe cylinder being-separated'from the gears to form a low-pressure chamber in the cylinder, the cylinder being provided-with an exhaustport communicating with said low-pressure chamber.

comprising a cylinder, iston means movable therein and dividing the cylinder into highpressure, intermediateressure and low-pressure portions, said cy Inder being provided withl orts communicatingres actively with said 'gh-pressure, intermediate-pressure tiontc the'high-pressuile port an Aan enginec .linderj having -a- 'supplyconnection om tlsi'eintermediate-pressure' ort;

com and with an outlet connection vir`i1n-1apolnt of intermediatepressure.- Y

ovv-pressure ports; and provi comprising aj' cylinder having h1 h-pressure and low-'pressure ports and provi ed with an outlet connection from a point of intermedi- 'ate pressure, 'and' means for conducting away and .utilizingthe ,fluid from s aid intermediatepressure outlet. i

`13. 'Anf expansive fluid-pressure engine com krising a cylinderhaving high-pressure and ow-pressure ports, vand provi ed with an atepressu're, and piston means connectedito JosEPH P. MAGNEY. WILLIAMv H. MAsrnniiaiv.v

presence of- ARTHUR P. KNIGHT,

FRED A. MANsFIELD.

landlow-pressure portions, al sup lyconnec- `115' expansive friui -pre'ss'ure'v engineprisinga cylinder' having'hi l-Ipressure 1 and utilizing the duid from said intermediateformed with inlet and outletv ports, and the 10. An expansive :duid-pressure engine A' lar-An espansa@ surpasser@ engine rio 

